<template>
  <div class="todo-header">
    <input
      type="text"
      placeholder="请输入你的任务名称，按回车键确认"
      v-model="title"
      @keyup.enter="add"
    />
  </div>
</template>

<script>
import { defineComponent, ref } from "vue";
import { nanoid } from "nanoid";
export default defineComponent({
  name: "MyHeader",
  setup(props,context) {
    let title = ref("");
    const add = () => {
      //校验数据
      if (!title.value.trim()) return alert("输入不能为空");
  
      //将用户的输入包装成一个todo对象
      const todoObj = { id: nanoid(), title: title.value, done: false };
      //通知App组件去添加一个todo对象
      context.emit("addTodo", todoObj);
      // this.addTodo(todoObj)
      //清空输入
   title.value = "";
    };
    return { title, add };
  },
});
</script>

<style scoped>
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
